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Search: id:A011956
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A011956 Barlow packings with group R3m that repeat after 7n layers. +0
1
1, 2, 4, 10, 21, 42, 84, 164, 322, 620 (list; graph; listen)
OFFSET

3,2
REFERENCES

T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).

CROSSREFS

Adjacent sequences: A011953 A011954 A011955 this_sequence A011957 A011958 A011959

Sequence in context: A104432 A129211 A128461 this_sequence A018003 A065023 A078389

KEYWORD

nonn,easy

AUTHOR

njas

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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